<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box { 
            position: relative;
            width: 400px;
            border-bottom: 1px solid #ccc;
            margin: 100px auto;
        }
        .box input {
            width: 370px;
            height: 30px;
            border: 0;
            outline: none;
        }
        .box img {
            position: absolute;
            top:2px;
            right: 2px;
            width: 24px;
        }
    </style>
</head>
<body>
    <div class="box">
        <label for="">
            <img src="../p1378956633.91.jpg" id="eye">
        </label>
        <input type="password" name="" id="pwd">

    </div>
   
    <script>
  
  //1.获取元素
  var eye = document.getElementById('eye');
  var pwd = document.getElementById('pwd');
  //2.注册事件  处理程序
  var flag = true;
  eye.onclick = function() {
      if(flag == true){
        pwd.type = 'text';
        eye.src='../p33190.jpg';
        flag = false;
      }else{
        pwd.type = 'password';
        eye.src="../p1378956633.91.jpg";
        flag = true;
      }
  }

    </script>
</body>
</html>